package com.liwei.lwmail.cart.interceptor;

import com.liwei.common.constant.AuthServerConstant;
import com.liwei.common.constant.CartConstant;
import com.liwei.common.vo.MemberResponseVo;
import com.liwei.lwmail.cart.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 判断用户登录状态，并封装
 */
@Component
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {

        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberResponseVo member = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGING_USER);
        if (member != null){
            //登录
            userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies.length > 0){
            for (Cookie cookie : cookies) {
                String cookieName = cookie.getName();
                if (cookieName.equals(CartConstant.USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }

            }
        }
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            //分配一个临时用户
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        threadLocal.set(userInfoTo);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response,
                           Object handler,
                           ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (!userInfoTo.getTempUser()){
            Cookie cookie = new Cookie(CartConstant.USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setMaxAge(CartConstant.USER_COOKIE_MAX_AGE);
            cookie.setDomain("lwmall.com");
            response.addCookie(cookie);
        }
    }
}
